With the help of nuclear magnetic resonance spectrometer, a research group led by Prof. Wang Hui from the Hefei Institutes of Physical Science of the Chinese Academy of Sciences has prepared a carbon-covered hollow cuprous oxide high-efficiency catalyst by using the solvent autocarbonylation reduction strategy, which provided a new solution for the electrocatalytic carbon dioxide reduction reaction (CO2RR) in the preparation of multicarbon (C2+) products.